Power distribution circuit and radio frequency front-end transceiving apparatus

ABSTRACT

A power distribution circuit applied to a radio frequency front-end transceiving apparatus includes a common-stage amplifying circuit and a branch-stage amplifying circuit, in which the branch-stage amplifying circuit comprises at least two parallel channel amplifying circuits; the common-stage amplifying circuit is configured to perform a first signal processing on a radio frequency signal received by an antenna of the radio frequency front-end transceiving apparatus to obtain a first power signal and output the first power signal to each of channel amplifying circuits, in which the first signal processing at least includes a buffering processing, an isolation processing and a low-noise amplifying processing; each channel amplifying circuit is configured to perform a second signal processing on the first power signal to obtain a second power signal and output the second power signal to a radio transceiving device; the second signal processing at least includes a low-noise amplifying processing.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation of International Application No.PCT/CN2021/134869 filled on Dec. 1, 2021, which claims priority toChinese Patent Application No. 202110404744.X filled on Apr. 15, 2021.The disclosures of the above-referenced applications are herebyincorporated by reference in their entirety.

BACKGROUND

In some implementations, the power distribution of single input-multipleoutput is realized by adding a power splitter before at least twoparallel-channel low-noise amplifiers.

SUMMARY

The present disclosure relates to the radio frequency circuittechniques, particularly to a power distribution circuit and a radiofrequency front-end transceiving apparatus.

Embodiments of the disclosure intend to provide the power distributioncircuit and a radio frequency front-end transceiving apparatus.

In an aspect, some embodiments of the disclosure provide a powerdistribution circuit which is applied to the radio frequency front-endtransceiving apparatus and includes a common-stage amplifying circuitand a branch-stage amplifying circuit, in which the branch-stageamplifying circuit at least includes two parallel channel amplifyingcircuits; and the common-stage amplifying circuit is configured toperform a first signal processing on a radio frequency signal receivedby an antenna of the radio frequency front-end transceiving apparatus toobtain a first power signal and output the first power signal to each ofthe channel amplifying circuits, in which the first signal processing atleast includes a buffering processing, an isolation processing and alow-noise amplifying processing; each of the channel amplifying circuitsis configure to perform a second signal processing on the first powersignal to obtain a second power signal and output the second powersignal to a radio transceiving device of the radio frequency front-endtransceiving apparatus, and the second signal processing at leastincludes a low-noise amplifying processing.

In another aspect, some embodiments of the disclosure also provide theradio frequency front-end transceiving apparatus including the powerdistribution circuit.

It should be understood that both the foregoing general description andthe following detailed description are exemplary and explanatory and arenot restrictive of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate embodiments consistent with thedisclosure, and together with the description, serve to describe thetechnical solutions of the disclosure.

FIG. 1 is a schematic diagram of the structure of a radio frequencyfront-end transceiving apparatus in some implementations;

FIG. 2 is a schematic diagram of the structure of a one-to-two powerdistribution circuit in some implementations, in which a singleinput-dual output is realized by a power splitter;

FIG. 3 is a schematic diagram of the structure of a power distributioncircuit provided by some embodiments of the disclosure;

FIG. 4 is a schematic diagram of the structure of another powerdistribution circuit provided by some embodiments of the disclosure;

FIG. 5 is a schematic diagram of the structure of yet another powerdistribution circuit provided by some embodiments of the disclosure;

FIG. 6 is a schematic diagram of the structure of a one-to-two powerdistribution circuit provided by some embodiments of the disclosure;

FIG. 7 is a block diagram of the constitution of a one-to-two powerdistribution circuit provided by some embodiments of the disclosure;

FIG. 8 is a schematic diagram of the structure of an equivalent circuitcorresponding to a one-to-two power distribution circuit provided bysome embodiments of the disclosure;

FIG. 9 is a schematic diagram of the structure of an equivalent circuitcorresponding to another one-to-two power distribution circuit providedby some embodiments of the disclosure; and

FIG. 10 is a schematic diagram of the structure of a radio frequencyfront-end transceiving apparatus provided by some embodiments of thedisclosure.

DETAILED DESCRIPTION

The disclosure is described in further detail below with reference tothe drawings and embodiments. It is to be understood that theembodiments provided herein are only used to explain the disclosure butnot to limit the disclosure. In addition, the embodiments provided beloware part of, rather than all, embodiments for implementing theinvention. The technical solutions described in the embodiments of thedisclosure can be implemented in any combinations, as long as noconflict.

It should be noted that in the embodiments of the disclosure, the terms“include/including”, “comprise/comprising” or any other variationthereof, intend to cover a non-exclusive inclusion, such that a circuitincluding a series of elements includes not only the explicitly recordedelements, but also other element(s) that is not recorded, or that isinherent to the circuit. Without further limitation, the definition ofan element by “(a circuit) includes/comprises an element” does notexclude the presence of an additional related element in the circuit.

The term “and/or” as used herein is merely an association relationshipthat describes associated objects, indicating that there may be threerelationships. For example, U and/or W, means three situations that Uexists only, U and W exist simultaneously, and W exists only. Inaddition, the term “at least one” as used herein refers to any one of aplurality, or any combinations of at least two of the plurality. Forexample, including at least one of U, W and V means including any one ormore elements selected from the group consisting of U, W and V.

The introduction of the power splitter deteriorates the noisecoefficient at an output end. Therefore, a low-noise amplifier can beadded at the front-end of the splitter to increase the channel gain andreduce the noise coefficient at the output end of the channel, which,however, would cause the radio frequency front-end transceivingapparatus to occupy a large area.

Carrier aggregation (CA) is introduced to increase transmissionbandwidth in 4G communication. In addition to CA, there are EUTRA-NRdual connection (EN-DC) mode and a multiple input-multiple output (MIMO)mode in 5G communication. All the three modes require at least twochannels to receive and transmit signals simultaneously.

For the case where there is only one receive (RX) channel antenna, thatis, two frequency bands share one input port and one antenna, thestructure of such radio frequency front-end transceiving apparatus isshown in FIG. 1 . As shown in FIG. 1 , the antenna 101 is configured toreceive a radio frequency signal and output the received radio frequencysignal to channel 1 low-noise amplifier 102 and channel 2 low-noiseamplifier 103, in which the channel 1 low-noise amplifier 102 and thechannel 2 low-noise amplifier 103 are configured to perform thelow-noise amplifying processing on the radio frequency signal receivedby the antenna 101 and output the low-noise amplifying processed powersignal to the radio transceiving device 104. Since the radio frequencysignal received by the antenna 101 is directly output to the channel 1low-noise amplifier 102 and the channel 2 low-noise amplifier 103without an isolation processing, a buffering processing, or the like,the effect of the power signal obtained at the output end of the channelis poor.

In some implementations, the main method to realize the singleinput-dual output one-to-two distribution is the power splitter(hereinafter also referred to as splitter). In the method, the splitteris added between the antenna and the channel low-noise amplifyingcircuits of the radio frequency front-end transceiving apparatus.Referring to FIG. 2 , radio frequency signal RFin received from theantenna is connected to the input end of the splitter 201, and theoutput end 1 of the splitter 201 is connected to the channel 1 low-noiseamplifier 202; and output end 2 of the splitter 201 is connected to thechannel 2 low-noise amplifier 203. The output of the channel 1 low-noiseamplifier 202 is the channel 1 radio frequency power output signal RX1out; and the output of the channel 2 low-noise amplifier 203 is thechannel 2 radio frequency power output signal RX2 out.

It can be understood that the structures of the circuits of the channel1 low-noise amplifier 202 and the channel 2 low-noise amplifier 203 arethe same, including an input impedance matching circuit, a cascodecircuit structure, a radio frequency protection circuit and an outputimpedance matching circuit, respectively. The channel 1 low-noiseamplifier 202 includes RX1 input impedance matching circuit 2021, RX1cascode circuit structure 2022, RX1 radio frequency protection circuit2023 and RX1 output impedance matching circuit 2024. The channel 2low-noise amplifier 203 includes RX2 input impedance matching circuit2031, RX2 cascode circuit structure 2032, RX2 radio frequency protectioncircuit 2033 and RX2 output impedance matching circuit 2034.

Here, one end of the RX1 input impedance matching circuit 2021 isconnected to the output end 1 of the splitter, and another end of theRX1 input impedance matching circuit 2021 is connected to the input endof the RX1 cascode circuit structure 2022, and the output end of the RX1cascode circuit structure 2022 is connected to the input end of the RX1output impedance matching circuit 2024, the output end of the RX1 outputimpedance matching circuit 2024 is the channel 1 radio frequency poweroutput signal RX1 out, and the RX1 radio frequency protection circuit2023 is connected between the output end and the direct current powersupply of the RX1 cascode circuit structure 2022.

In FIG. 2 , the RX1 cascode circuit structure 2022 includes a firstcapacitor C1 and a second capacitor C2, a first transistor Q1, a secondtransistor Q2, a first inductor L1, a first bias voltage Vg11, a secondbias voltage Vg12, a direct current power supply positive terminal VCCand a ground terminal SGND; and the RX1 radio frequency protectioncircuit 2023 includes a third capacitor C3 and a second inductor 12.

C1 is connected between the output end of the input impedance matchingcircuit 2021 and the positive electrode of Vg11, and the negativeelectrode of the Vg11 is connected to SGND, and performs ananti-interference processing on the radio frequency signal passingthrough the input impedance matching circuit 2021. Vg11 provides a biasvoltage to Q1. The gate of Q1 is connected to the common node of C1 andVg11, and the source of Q1 is connected to SGND through the seriesconnected L1 for maintaining the stability of the circuit. The drain ofQ1 is connected to the source of Q2, and the gate of Q2 is connected tothe common node of C2 and Vg12. The positive electrode of Vg12 isconnected to one end of C2, and another end of C2 is connected to SGND,and the negative electrode of the Vg12 is connected to SGND. The drainof Q2 is connected to VCC through the series connected L2 to prevent theradio frequency signal from channeling into the circuit. C3 istransboundary between VCC and SGND for removing the radio frequencyinterference on VCC. The drain of Q2 serves as the output end of the RX1cascode circuit structure 2022.

The drain of Q2 is connected to the input end of the RX1 outputimpedance matching circuit 2024, and the output end of the RX1 outputimpedance matching circuit 2024 serves as the channel 1 radio frequencypower output signal RX1 out.

Since the structure of the circuit of the channel 1 low-noise amplifier202 are same as those of the circuit the channel 2 low-noise amplifier203, the detailed description of the latter is omitted herein.

It can be understood that the active loss of the splitter degrades thenoise factor at the output end of the channel. If the active loss of thesplitter was L, the noise factor deteriorates by L times, by referringto equation (1),

F _(out_RX1/RX2) =L*F _(RX1/RX2)*2  (1);

in which F_(RX1/RX2) represents the noise factor of RX1 channel or RX2channel, and the F_(out_RX1/RX) represents the noise factor at theoutput end of RX1 or RX2.

The noise factor at the output end of RX1 is obtained by multiplying thenumber of equal division of the splitter, i.e. 2, with the active loss Lof the splitter, and then with the noise factor of the RX1 channel.Similarly, the noise factor at the output end of RX2 is obtained bymultiplying the number of equal division of the splitter, i.e. 2, withthe active loss L of the splitter, and then with the noise factor of theRX2 channel.

It can be seen from the equation (1) that the introduction of thesplitter increases the noise factor at the output end of RX1 or that ofRX2, i.e., the noise factors at the output ends of the channels.

Some embodiments of the disclosure provide a power distribution circuit.Referring to FIG. 3 , the power distribution circuit 300 is applied tothe radio frequency front-end transceiving apparatus, and includes acommon-stage amplifying circuit 301 and a branch-stage amplifyingcircuit 302, in which the branch-stage amplifying circuit 302 at leastincludes two parallel channel amplifying circuits.

The common-stage amplifying circuit 301 is configured to perform a firstsignal processing on a radio frequency signal received by an antenna ofthe radio frequency front-end transceiving apparatus to obtain a firstpower signal, and output the first power signal to each of the channelamplifying circuits, respectively. The first signal processing at leastincludes a buffering processing, a isolation processing and a low-noiseamplifying processing.

Each of the channel amplifying circuits is configured to perform asecond signal processing on the first power signal to obtain a secondpower signal and output the second power signal to a radio transceivingdevice of the radio frequency front-end transceiving apparatus. Thesecond signal processing at least includes the low-noise amplifyingprocessing.

It can be understood that the radio frequency front-end transceivingapparatus may include the transceiving antenna, at least two of thetransceiving channels and the radio transceiving device.

In one example, the common-stage amplifying circuit 301 may be alow-noise amplifier (LNA), and the channel amplifying circuits may alsobe a LNAs, i.e. the branch-stage amplifying circuit 302 may also atleast include two parallel LNAs.

In some possible embodiments, the amplification times of the low-noiseamplifying processing in the first signal processing is not limited, andin actual applications, the amplification times may be determinedaccording to specific design requirements.

It can be understood that each of the channel amplifying circuits in thebranch-stage amplifying circuit 302 may be equivalent to a parallel loadof the common-stage amplifying circuit 301, that is, the output power ofthe common-stage amplifying circuit 301 is distributed to each of thechannel amplifying circuits, and achieves one-to-many equal powerdistribution, when the input impedances of the amplifying circuits arethe same.

In some possible embodiments, in the case that the value of the inputimpedance of each of the channel amplifying circuits is the same, eachof the channel amplifying circuits outputs the same power value.

In the embodiment of the disclosure, by providing the common-stageamplifying circuit, which is capable of carrying out the bufferingprocessing, the isolation processing and the low-noise amplifyingprocessing on the radio frequency signal received by the antenna of theradio frequency front-end transceiving apparatus, the power distributionof single input-multiple output can be realized, and thus the noisecoefficient at the output end can be reduced without a power splitter,and meanwhile the area occupied by the radio frequency front-endtransceiving apparatus is reduced.

FIG. 4 is the schematic diagram of the structure of another powerdistribution circuit according to some embodiments of the disclosure. Asshown in FIG. 4 , the power distribution circuit 400 is applied to theradio frequency front-end transceiving apparatus, and includes an inputimpedance matching circuit 401, a low-noise amplifying circuit structure402, a radio frequency anti-interference circuit 403, and a first toN-th amplifying circuit 404, in which N is an integer greater than 2.

The input impedance matching circuit 401 is configured to perform aninput impedance matching processing on the radio frequency signalreceived by an antenna 405 of the radio frequency front-end transceivingapparatus to obtain a radio frequency signal processed by the inputimpedance matching processing, and output the radio frequency signalprocessed by the input impedance matching processing to the low-noiseamplifying circuit structure 402.

The low-noise circuit amplifying structure 402 is configured to performthe first signal processing on the radio frequency signal processed bythe input impedance matching processing to obtain the first powersignal, and output the first power signal to each of the channelamplifying circuits, respectively. The first signal processing at leastincludes the buffering processing, the isolation processing and thelow-noise amplifying processing.

The radio frequency anti-interference circuit 403 is connected betweenthe output end of the low-noise amplifying circuit structure and thedirect current power supply of the low-noise amplifying circuitstructure for preventing the radio frequency signal from channeling intothe direct current power supply, and realizing the protection of thecommon-stage amplifying circuit from being interfered by the radiofrequency.

The first to N-th amplifying circuit 404 is configured to perform thesecond signal processing on the first power signal to obtain the secondpower signal, and output the second power signal to a radio transceivingdevice 406 of the radio frequency front-end transceiving apparatus. Thesecond signal processing at least includes the low-noise amplifyingprocessing.

In one possible embodiment, the low-noise amplifying circuit structureis one of the common source circuit structure and the cascode circuitstructure. Here, any of the common source circuit structure and thecascode circuit structure may be a circuit for realizing low-noiseamplification of specific times for improving the bandwidth gain, thestability and the input impedance. Transistors in the common sourcecircuit structure and the cascode circuit structure may be any of ametal-oxide-semiconductor (CMOS), a bipolar junction transistor (BJT)and a field effect transistor (FET).

In one embodiment, the input impedance matching circuit 401 may bedesigned based on the bandwidth of the input radio frequency signal sothat the circuit can operate at the maximum output power state.

In the embodiment of the disclosure, with the input impedance matchingcircuit, the low-noise amplifying circuit structure and the radiofrequency anti-interference circuit, the radio frequency signal receivedby the antenna of the radio frequency front-end transceiving apparatusis processed by the buffering processing, the isolation processing andthe low-noise amplifying processing to obtain the first power signal.Therefore, the obtained first power signal is the processed signal bythe buffering processing, the isolation processing and the low-noiseamplifying processing; and an output power signal with a smaller noisefactor can be obtained by each of the channel amplifying circuitsperforming the second processing on the first power signal.

FIG. 5 is a schematic diagram of the structure of another powerdistribution circuit according to some embodiments of the disclosure. Asshown in FIG. 5 , the power distribution circuit 500 is applied to theradio frequency front-end transceiving apparatus, and includes acommon-stage amplifying circuit 501, an inter-stage matching circuit 502and a branch-stage amplifying circuit 503. Herein, the branch-stageamplifying circuit 503 at least includes two parallel channel amplifyingcircuits.

The common-stage amplifying circuit 501 is configured to perform thefirst signal processing on the radio frequency signal received by theantenna of the radio frequency front-end transceiving apparatus toobtain the first power signal, and output the first power signal to eachof the channel amplifying circuits. The first signal processing at leastincludes the buffering processing, the isolation processing and thelow-noise amplifying processing;

The inter-stage matching circuit 502 is configured to perform theimpedance matching between the common-stage amplifying circuit and eachof the channel amplifying circuits.

Each of the channel amplifying circuits is configured to perform thesecond signal processing on the first power signal to obtain the secondpower signal and output the second power signal to the radiotransceiving device of the radio frequency front-end transceivingapparatus. The second signal processing at least includes the low-noiseamplifying processing.

In the embodiment of the present disclosure, the inter-stage matchingcircuit connected between the common-stage amplifying circuit and eachof the channel amplifying circuits may be a circuit including acapacitor. In one example, the inter-stage matching circuit may be acapacitor with a set specific parameter, which may be the capacitor forperforming a DC blocking processing, but also has an impedance matchingeffect.

On the basis of the above-mentioned embodiments, some embodiments of thepresent disclosure provide a schematic diagram of the structure of aone-to-two power distribution circuit. As shown in FIG. 6 , the powerdistribution circuit includes first stage circuit 60, second stagecircuit 61 and inter-stage matching circuit 62. The second stage circuit61 includes first sub-circuit 610 and second sub-circuit 611. The outputend of the first stage circuit 60 is connected to an input end of theinter-stage matching circuit 62, and the output ends of the inter-stagematching circuit 62 are connected to the input ends of the firstsub-circuit 610 and the second sub-circuit 611, respectively, and theoutput ends of the first sub-circuit 610 and the second sub-circuit 611are RX1 output end and RX2 output end, respectively. The RX1 and RX2represent channel 1 and channel 2, respectively.

In the embodiment of the present disclosure, the first stage circuit 60is the common stage circuit, and the output end of the first stagecircuit 60 is directly connected to the second stage circuit 61 (theinter-stage matching circuit can be omitted), that is, the firstsub-circuit 610 and the second sub-circuit 611 are simultaneouslymounted on the output end of the first stage circuit 60. Since the firstsub-circuit 610 and the second sub-circuit 611 are equivalent to theload of the first-stage circuit 60 at the output end thereof, and thefirst sub-circuit 610 and the second sub-circuit 611 are connected inparallel, the output power of the first-stage circuit 60 is equallydivided by the first sub-circuit 610 and the second sub-circuit 611.Thus, the process of splitting one signal into two can be realizedwithout using a splitter.

In FIG. 6 , since the compositions and structures of the first stagecircuit 60, the first sub-circuit 610, and the second sub-circuit 611are similar, all including an integrated amplifying circuit 600consisting of a cascode structure and a radio frequencyanti-interference resistor with the difference that the first stagecircuit 60 further includes an input impedance matching circuit 612, thefirst sub-circuit 610 further includes a first output impedance matchingcircuit 613 and a seventh capacitor C7, and the second sub-circuitfurther includes a second output impedance matching circuit 614 and aneighth capacitor C8.

It can be seen that in the first stage circuit 60, the output end of theinput impedance matching circuit 612 is connected to the input end ofthe integrated amplifying circuit 600, and the output end of theintegrated amplifying circuit 600 is the output end of the first stagecircuit 60. In the first sub-circuit 610, C7 is connected between theoutput end of the inter-stage matching circuit 62 and the input end ofthe integrated amplifying circuit 600, and the output end of theintegrated amplifying circuit 600 is connected to the input end of thefirst output impedance matching circuit 613, and the output end of thefirst output impedance matching circuit 613 is used as the RX1 outputend. In the second sub-circuit 611, C8 is connected between the outputend of the inter-stage matching circuit 62 and the input end of theintegrated amplifying circuit 600, and the output end of the integratedamplifying circuit 600 is connected to the input end of the secondoutput impedance matching circuit 613, and the output end of the secondoutput impedance matching circuit 614 is used as the RX2 output end.

The integrated amplifying circuit 600 in the first stage circuit 60includes a ninth capacitor C9 and a tenth capacitor C10, a fifthtransistor Q5, a sixth transistor Q6, a fifth inductor L5, a sixthinductor L6, a fifth bias voltage Vg31, a sixth bias voltage Vg32, adirect current power supply positive terminal VCC, and a ground terminalSGND.

The output end of the input impedance matching circuit 612 is connectedto the positive electrode of Vg31, and the negative electrode of Vg31 isconnected to SGND. The gate of Q5 is connected to a common node of Vg31and the input impedance matching circuit 612, and Vg31 is used forproviding a bias voltage to Q5. The source of Q5 is connected to SGNDthrough connecting L5 in series for keeping the stability of thecircuit. The drain of Q5 is connected to the source of Q6, and the gateof Q6 is connected to a common node of C9 and Vg32. The positiveelectrode of Vg32 is connected to one end of C9, the other end of C9 isconnected to SGND, and the negative electrode of Vg32 is connected toSGND. The drain of Q6 is connected to VCC through connecting L6 inseries to prevent the radio frequency signal from channeling into thecircuit. C10 is transboundary between VCC and SGND for removing theradio frequency interference on VCC. The drain of Q6 serves as theoutput end of the integrated amplifying circuit 600 in the first stagecircuit 60.

The integrated amplifying circuit 600 in the first sub-circuit 610includes an eleventh capacitor C11 and a twelfth capacitor C12, aseventh transistor Q7, an eighth transistor Q8, a seventh inductor L7,an eighth inductor L8, a seventh bias voltage Vg41, an eighth biasvoltage Vg42, a direct current power supply positive terminal VCC, and aground terminal SGND.

The positive electrode of Vg41 is connected to one end of C7, and thenegative electrode of Vg41 is connected to SGND. The gate stage of Q7 isconnected to a common node of Vg41 and C7, and Vg41 is used forsupplying a bias voltage to Q7. The source stage of Q7 is connected toSGND through cascading L7 for keeping the circuit stable. The drain ofQ7 is connected to the source of Q8, and the gate of Q8 is connected toa common node of C11 and Vg42. The positive electrode of Vg42 isconnected to one end of C11, the other end of C11 is connected to SGND,and the negative electrode of Vg42 is connected to SGND. The drain of Q8is connected to VCC through cascading L8 to prevent the radio frequencysignal from channeling into the circuit. C12 is transboundary betweenVCC and SGND for removing the radio frequency interference on VCC. Thedrain of Q8 serves as the output end of the integrated amplifyingcircuit 600 in the first sub-circuit 610.

The integrated amplifying circuit 600 in the second sub-circuit 611includes a thirteenth capacitor C13 and a fourteenth capacitor C14, aninth transistor Q9, a tenth transistor Q10, a ninth inductor L9, atenth inductor L10, a ninth bias voltage Vg51, a tenth bias voltageVg52, a direct current power supply positive terminal VCC, and a groundterminal SGND.

The positive electrode of Vg51 is connected to one end of C8, and thenegative electrode of Vg51 is connected to SGND. The gate stage of theQ9 is connected to a common node of Vg51 and C8, and Vg51 is used forsupplying the bias voltage to Q9. The source stage of Q9 is connected toSGND by cascading L9 for maintaining the stability of the circuit. Thedrain of Q9 is connected to the source of Q10, and the gate of Q10 isconnected to a common node of C13 and Vg52. The positive electrode ofVg52 is connected to one end of C13, the other end of C13 is connectedto SGND, and the negative electrode of Vg52 is connected to SGND. Thedrain of Q10 is connected to VCC through connecting L10 in series toprevent the radio frequency signal from channeling into the circuit. C14is transboundary between VCC and SGND for removing the radio frequencyinterference on VCC. The drain of Q10 serves as the output end of theintegrated amplifying circuit 600 in the second sub-circuit 611.

It can be understood that when one of the RX1 channel corresponding tothe first sub-circuit 610 and the RX2 channel corresponding to thesecond sub-circuit 611 words alone, the other channel is in a closedstate, that is, the output impedance of the other channel represents ahigh impedance, which is equivalent to an open circuit which does notaffect the circuit in the operating state.

FIG. 7 is a block diagram showing the constitution of a one-to-two powerdistribution circuit according to some embodiments of the disclosure. Asshown in FIG. 7 , the power distribution circuit includes a radiofrequency signal RFin from the antenna, a first stage circuit 701, afirst channel sub-circuit 702, a second channel sub-circuit 703, theoutput end 704 of the first channel sub-circuit 702, and the output end705 of the second channel sub-circuit 703. Zin_12 represents anequivalent input impedance of the first channel sub-circuit 702. Zin_22represents an equivalent input impedance of the second channelsub-circuit 703.

Based on FIG. 7 , when the first channel sub-circuit 702 is in theoperating state and the second channel sub-circuit 703 is in the offstate, the second channel sub-circuit 703 is equivalent to an opencircuit, since the equivalent input impedance Zin_22 of the secondchannel sub-circuit 703 is in high resistance. As shown in FIG. 8 , thedotted line frame shows the equivalent impedance Zin_22_OFF of thesecond channel sub-circuit 703 in the off state, and it can be seen thatthe Zin_22_OFF is much greater than the equivalent impedance Zin_12_Onof the first sub-circuit in the operating state.

FIG. 9 is a schematic diagram of the structure of an equivalent circuitcorresponding to another one-to-two power distribution circuit accordingto some embodiments of the disclosure. As shown in FIG. 9 , thefirst-stage circuit 60 is equivalent to current source I_1-SOURCE, andZin_12 and Zin_22 are input impedances of RX1 channel and RX2 channel,respectively. Since Zin_12=Zin_22, so I1=I2, I1{circumflex over( )}2*Zin_12=I2{circumflex over ( )}2*Zin_22.

FIG. 10 is a schematic diagram of the structure of a radio frequencyfront-end transceiver apparatus provided in some embodiments of thepresent disclosure. As shown in FIG. 10 , the radio frequency front-endtransceiver apparatus 1000 includes an antenna 1001, a powerdistribution circuit 1002 connected to the antenna 1001, and a radiotransceiving device 1003 is wired to the power distribution circuit1002.

Here, the antenna 1001 is configured for receiving or transmitting aradio frequency signal, and transmitting the radio frequency signal tothe power distribution circuit 1002, with which the radio frequencysignal is subjected to one to many power distribution and amplificationto obtain multiple power signals which are transmitted to the radiotransceiving device 1003.

The above description of the embodiments tends to emphasize differencesbetween the various embodiments, and the same or similar aspects of theembodiments can be referred to each other, and are not repeated hereinfor the sake of brevity.

The features disclosed in the examples of the circuits provided hereincan be arbitrarily combined, as long as there is no conflict, to yieldnew examples of circuits.

Various embodiments of the present disclosure can have one or more ofthe following advantages.

The single input-multiple output power distribution is achieved bysetting the common-stage amplifying circuit, which is capable ofperforming the buffering processing, the isolation processing and thelow-noise amplifying processing on the radio frequency signal receivedby the antenna of the radio frequency front-end transceiving apparatus,at front-end of each of the channel amplifying circuits, and thereforethe noise coefficient at the output end can be reduced even without thepower splitter, and meanwhile, the area occupied by the radio frequencyfront-end transceiving apparatus is reduced.

Various modifications of, and equivalent acts corresponding to, thedisclosed aspects of the example embodiments, in addition to thosedescribed above, can be made by a person of ordinary skill in the art,having the benefit of the present disclosure, without departing from thespirit and scope of the disclosure defined in the following claims, thescope of which is to be accorded the broadest interpretation so as toencompass such modifications and equivalent structures.

What is claimed is:
 1. A power distribution circuit, which is applied toa radio frequency front-end transceiving apparatus, comprising: acommon-stage amplifying circuit and a branch-stage amplifying circuit,wherein the branch-stage amplifying circuit comprises at least twoparallel channel amplifying circuits; the common-stage amplifyingcircuit is configured to perform a first signal processing on a radiofrequency signal received by an antenna of the radio frequency front-endtransceiving apparatus to obtain a first power signal, and output thefirst power signal to each of the channel amplifying circuits,respectively, wherein, the first signal processing at least includes abuffering processing, an isolation processing and a low-noise amplifyingprocessing; each of channel amplifying circuits is configured to performa second signal processing on the first power signal to obtain a secondpower signal, and output the second power signal to a radio transceivingdevice of the radio frequency front-end transceiving apparatus; and thesecond signal processing at least includes a low-noise amplifyingprocessing.
 2. The circuit according to claim 1, wherein thecommon-stage amplifying circuit comprises a low-noise amplifying circuitstructure, which is configured to perform the first signal processing onthe radio frequency signal received by the antenna of the radiofrequency front-end transceiving apparatus to obtain the first powersignal, and output the first power signal to each of the channelamplifying circuits.
 3. The circuit according to claim 2, wherein thelow-noise amplifying circuit structure is one of a common source circuitstructure and a cascode circuit structure.
 4. The circuit according toclaim 2, wherein the common-stage amplifying circuit further comprisesan input impedance matching circuit; wherein, the input impedancematching circuit is configured to perform an input impedance matchingprocessing on the radio frequency signal received by the antenna of theradio frequency front-end transceiving apparatus to obtain an inputimpedance matching processed radio frequency signal, and output theinput impedance matching processed radio frequency signal to thelow-noise amplifying circuit structure; and correspondingly, thelow-noise amplifying circuit structure is configured to perform thefirst signal processing on the input impedance matching processed radiofrequency signal to obtain the first power signal, and output the firstpower signal to each of the channel amplifying circuits.
 5. The circuitaccording to claim 2, wherein the common-stage amplifying circuitfurther comprises a radio frequency anti-interference circuit; wherein,the radio frequency anti-interference circuit is connected between anoutput end of the low-noise amplifying circuit structure and a directcurrent power supply of the low-noise amplifying circuit structure, andis configured to prevent the radio frequency signal from channeling intothe direct current power supply, and protect the common-stage amplifyingcircuit from being interfered by the radio frequency.
 6. The circuitaccording to claim 1, further comprising: an inter-stage matchingcircuit, which is connected between the common-stage amplifying circuitand each of the channel amplifying circuits, is configured to perform animpedance matching on the common-stage amplifying circuit and each ofthe channel amplifying circuits.
 7. The circuit according to claim 1,wherein the common-stage amplifying circuit is a low-noise amplifier. 8.The circuit according to claim 1, wherein, under a condition that avalue of an input impedance of each of the channel amplifying circuitsis the same, an output power value of each of the channel amplifyingcircuits is the same.
 9. A radio frequency front-end transceivingapparatus, comprising the power distribution circuit according toclaim
 1. 10. The radio frequency front-end transceiving apparatusaccording to claim 9, further comprising an antenna, wherein a singleinput-multiple output power distribution is realized by setting thecommon-stage amplifying circuit configured to perform the bufferingprocessing, the isolation processing and the low-noise amplifyingprocessing on radio frequency signals received by the antenna, atfront-end of each of the at least two parallel channel amplifyingcircuits, to thereby reduce a noise coefficient at an output end evenwithout a power splitter, and reduce an area occupied by the radiofrequency front-end transceiving apparatus.